Jiaxing City Qunbang Hardware Co., Ltd
| Supply Ability | 800TON/MONTH |
| Packaging Details | 25KG/BAG |
| Hdg Thickness | AVG 53um |
| Delivery Time | 15DAY |
| Model Number | DIN933 |
| Certification | ISO9001 |
| Brand Name | QBH |
| Place of Origin | CHINA |
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Product Specification
| Supply Ability | 800TON/MONTH | Packaging Details | 25KG/BAG |
| Hdg Thickness | AVG 53um | Delivery Time | 15DAY |
| Model Number | DIN933 | Certification | ISO9001 |
| Brand Name | QBH | Place of Origin | CHINA |
| High Light | ASTM F3125 Grade A325M Heavy Hex Structural Bolt ，830 MPa Tensile Strength Structural Bolt ，M12 to M36 Sizes A325M Bolt | ||
ASTM F3125 Grade A325M Heavy Hex Structural Bolt – Metric, Type 1, M12 to M36
This product is a metric heavy hex structural bolt manufactured to ASTM F3125/F3125M, Grade A325M, Type 1, in the Heavy Hex style. F3125 was originally issued as a consolidation and replacement of six structural bolting ASTM standards, including A325 and A325M. Grade A325M Heavy Hex bolts are furnished in sizes M12 to M36 inclusive. Type 1 denotes medium-carbon, carbon boron, medium carbon alloy, or alloy boron steel. The bolt delivers a minimum tensile strength of 830 MPa and a minimum yield strength of 660 MPa. Intended for use in structural connections covered in the Specification for Structural Joints Using High-Strength Bolts, as approved by the Research Council on Structural Connections (RCSC).
What are the mechanical property and material composition requirements for F3125 Grade A325M Type 1 bolts?
Grade A325M bolts require a minimum tensile strength of 830 MPa and a minimum yield strength of 660 MPa across all diameters from M12 to M36. This alignment of tensile requirements regardless of diameter is a key outcome of the F3125 consolidation. Type 1 material is designated as medium-carbon steel, carbon boron steel, medium carbon alloy steel, or alloy boron steel. The bolts are quenched and tempered. Type 3 (weathering steel) is also available under the same grade for atmospheric corrosion resistance applications, while Type 2 was withdrawn in 2003.
What are the dimensional specifications and thread configurations for M12 to M36 A325M heavy hex bolts?
The bolts conform dimensionally to the heavy hex style for metric sizes M12 through M36 inclusive. Threads are ISO metric coarse pitch, with thread pitches per ISO 261. The heavy hex head provides enlarged widths across flats compared to standard hex bolts, consistent with structural bolting practice. Bolts may be ordered with standard dimensions or with supplemental requirement S2 for non-standard dimensions (thread length, head style), in which case the head is marked with an “S" as required by F3125. Metric bolts are included in F3125/F3125M but are not always shown in North American marking figures since they have not been in common use in that region.
What are the marking, traceability, and assembly component requirements for Grade A325M Type 1 bolts?
Each bolt head must be permanently marked with the grade symbol “A325M" and the manufacturer’s identification mark (typically a symbol or letter code). Type 1 bolts may optionally be marked with three radial lines 120° apart, though this is not mandatory. The complete assembly comprises the A325M heavy hex bolt, a matching ASTM A563M heavy hex nut, and a hardened washer to ASTM F436M. Heavy hex bolts may be ordered individually, packaged with nuts, packaged with nuts and washers, or as complete assemblies. Full traceability is maintained through lot control, with each batch linked to Material Test Reports (MTRs) and available EN 10204 Type 3.1 inspection certificates upon request. Rotational-capacity testing is required on all bolt, nut, and washer assemblies prior to shipping.
Company Details
Business Type:
Manufacturer,Trading Company,Seller
Year Established:
2014
Total Annual:
3000-4500
Employee Number:
100~150
Ecer Certification：
Verified Supplier
Jiaxing City Qunbang Hardware Co., Ltd. (brand: QBH) is a fastener enterprise integrating production, design, sales, and after-sales service. The company is located in the Hangzhou-Jiaxing-Huzhou Plain, close to Shanghai, Ningbo, and Zhapu ports. Thanks to its superior geographical position and conv... Jiaxing City Qunbang Hardware Co., Ltd. (brand: QBH) is a fastener enterprise integrating production, design, sales, and after-sales service. The company is located in the Hangzhou-Jiaxing-Huzhou Plain, close to Shanghai, Ningbo, and Zhapu ports. Thanks to its superior geographical position and conv...
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